/*
 * $Id: ContentTypeInterceptor.java 666756 2008-06-11 18:11:00Z hermanns $
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package restful.struts2;

import java.io.*;

import javax.servlet.http.*;

import org.apache.struts2.*;

import restful.struts2.handler.*;

import com.opensymphony.xwork2.*;
import com.opensymphony.xwork2.inject.*;
import com.opensymphony.xwork2.interceptor.*;

/**
 * Uses the content handler to apply the request body to the action
 */
public class ContentTypeInterceptor implements Interceptor {

	private static final long serialVersionUID = 1L;
	ContentTypeHandlerManager selector;

	@Inject
	public void setContentTypeHandlerSelector(ContentTypeHandlerManager sel) {
		this.selector = sel;
	}
	
	public void destroy() {}

	public void init() {}

	public String intercept(ActionInvocation invocation) throws Exception {
		HttpServletRequest request = ServletActionContext.getRequest();
		ContentTypeHandler handler = selector.getHandlerForRequest(request);

		Object target = invocation.getAction();
		if (target instanceof ModelDriven) {
			target = ((ModelDriven) target).getModel();
		}
		if (target == null) {
			target = invocation.getAction();
		}
		if (handler != null && request.getContentLength() > 0) {
			InputStream is = request.getInputStream();
			InputStreamReader reader = new InputStreamReader(is);
			handler.toObject(reader, target);
		}
		return invocation.invoke();
	}

}
